Wednesday, October 20, 2010

Piping Questionaire

Q: What is the most commonly used material for Gasket.
Ans: Compressed Asbestos Fibre.

Q: Which type of gasket is recommended for high temperature & high pressure application.

Ans: Spiral wound Metallic Gasket.

Q: What are the criteria for selection of MOC of Spiral Wound Metallic Gasket winding material.

Ans: The selection of material of construction for Gasket winding depends upon:-
A) The corrosive nature and concentration of fluid being carried.
B) The operating temeperature of the fluid.
C) The relative cost of alternative winding material.

Q: What are the most common materials used for spiral wound metallic gasket winding.
Ans: The most commonly used material for spiral wound metallic gasket winding is:-
A) Austenitic stainless steel 304 with asbetos filler.
B) Austenitic stainless steel 316 with asbetos filler.
C) Austenitic stainless steel 321 with asbetos filler.

Q: Which material is used as filler material for spiral wound gasket in case of high temperature services.

Ans: For very high temperature services, graphite filler is used.

Q: What is centering ring in connection to spiral wound gasket.
Ans: Spiral wound gaskets are provided with carbon steel external ring called centering ring.

Q: What will be the AARH finish on flange face for using spiral wound gasket.
Ans: 125-250 AARH finish.

Q: Up to what temperature the carbon steel materials shall be used.
Ans: Carbon steel materials shall be used for temperature up to 425 C.

Q: Which material is used for temperature above 426 C.
Ans: Alloy steel materials shall be used for temperature above 426 C.

Q: Which type of material is used for corrosive fluid.
Ans: Stainless steel materials shall be used for corrosive fluid.

Q: Which type of piping materials are used for drinking water, instrument air etc.
Ans: Galavanized steel materials shall be used for drinking water, instrument air and NI lines (LP).

Q: What is the difference between Pipe and Tube.
Ans: Pipe is identified by NB and thickness is defined by Schedule whereas Tube is identified by OD & its thickness as BWG (Birmingham wire gauge or 1/100 inch).

Created by: Mihir Thakur
Checked by: Sanjay Singh

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